diff options
Diffstat (limited to 'vendor/backtrace/src/symbolize/gimli/libs_windows.rs')
-rw-r--r-- | vendor/backtrace/src/symbolize/gimli/libs_windows.rs | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/vendor/backtrace/src/symbolize/gimli/libs_windows.rs b/vendor/backtrace/src/symbolize/gimli/libs_windows.rs deleted file mode 100644 index b47ed42..0000000 --- a/vendor/backtrace/src/symbolize/gimli/libs_windows.rs +++ /dev/null @@ -1,89 +0,0 @@ -use super::super::super::windows::*; -use super::mystd::os::windows::prelude::*; -use super::{coff, mmap, Library, LibrarySegment, OsString}; -use alloc::vec; -use alloc::vec::Vec; -use core::mem; -use core::mem::MaybeUninit; - -// For loading native libraries on Windows, see some discussion on -// rust-lang/rust#71060 for the various strategies here. -pub(super) fn native_libraries() -> Vec<Library> { - let mut ret = Vec::new(); - unsafe { - add_loaded_images(&mut ret); - } - return ret; -} - -unsafe fn add_loaded_images(ret: &mut Vec<Library>) { - let snap = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, 0); - if snap == INVALID_HANDLE_VALUE { - return; - } - - let mut me = MaybeUninit::<MODULEENTRY32W>::zeroed().assume_init(); - me.dwSize = mem::size_of_val(&me) as DWORD; - if Module32FirstW(snap, &mut me) == TRUE { - loop { - if let Some(lib) = load_library(&me) { - ret.push(lib); - } - - if Module32NextW(snap, &mut me) != TRUE { - break; - } - } - } - - CloseHandle(snap); -} - -unsafe fn load_library(me: &MODULEENTRY32W) -> Option<Library> { - let pos = me - .szExePath - .iter() - .position(|i| *i == 0) - .unwrap_or(me.szExePath.len()); - let name = OsString::from_wide(&me.szExePath[..pos]); - - // MinGW libraries currently don't support ASLR - // (rust-lang/rust#16514), but DLLs can still be relocated around in - // the address space. It appears that addresses in debug info are - // all as-if this library was loaded at its "image base", which is a - // field in its COFF file headers. Since this is what debuginfo - // seems to list we parse the symbol table and store addresses as if - // the library was loaded at "image base" as well. - // - // The library may not be loaded at "image base", however. - // (presumably something else may be loaded there?) This is where - // the `bias` field comes into play, and we need to figure out the - // value of `bias` here. Unfortunately though it's not clear how to - // acquire this from a loaded module. What we do have, however, is - // the actual load address (`modBaseAddr`). - // - // As a bit of a cop-out for now we mmap the file, read the file - // header information, then drop the mmap. This is wasteful because - // we'll probably reopen the mmap later, but this should work well - // enough for now. - // - // Once we have the `image_base` (desired load location) and the - // `base_addr` (actual load location) we can fill in the `bias` - // (difference between the actual and desired) and then the stated - // address of each segment is the `image_base` since that's what the - // file says. - // - // For now it appears that unlike ELF/MachO we can make do with one - // segment per library, using `modBaseSize` as the whole size. - let mmap = mmap(name.as_ref())?; - let image_base = coff::get_image_base(&mmap)?; - let base_addr = me.modBaseAddr as usize; - Some(Library { - name, - bias: base_addr.wrapping_sub(image_base), - segments: vec![LibrarySegment { - stated_virtual_memory_address: image_base, - len: me.modBaseSize as usize, - }], - }) -} |